Students shouldn’t be given so difficult a problem ______they can not work out.
| A．that | B．which | C．while | D．as |
——Do you have a minute? I’ve got something to tell you.
——Ok, ______ you make it short.
| A．now that | B．if only | C．so long as | D．every time |
Animals suffered at the hands of Man ___ they were destroyed by people to make way for agricultural had to provide food for more people.
| A．in which | B．for which | C．so that | D．in that |
We finished the run in less than half the time ____.
| A．allowing | B．to allow | C．allowed | D．allows |
——-Shall we go out for a walk?
——Sorry. This is not the right ____ to invite me. I am too tired to walk.
| A．moment | B．situation | C．place | D．chance |
It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
| A．process | B．attention | C．measure | D．part |